#include<stdio.h>
using namespace std;
int main(){
    int n,count=0;
    scanf("%d",&n);
    while(n!=1){
        if (n%2==0){
            n/=2;
        }else{
            n = (3*n+1)/2;
        }
        count++;
    }   
    printf("%d",count);
    return 0;
}